In August of 2005 the United States Congress passed the Energy Policy Act, which changes the dates of both the start and end of daylight saving time (DST) from 2007.
While the change in daylight saving time applies to U.S. and Canada, it may have an impact also on customers who interact or integrate with systems that are based in North America or rely on such date/time for calculations.
Windows Client, windows Server, Windows Mobile, Sharepoint Services, Exchange Server and Office Outlook are some of the Microsoft Products which will be affected by the DTS changes.
Updates to these products are being developed and tested. Depending on the particular product or scenario, these updates will be released through Microsoft Customer Support Services (CSS), Hotfixes incorporated in Knowledge Base articles, Windows Update, Microsoft Update, Windows Server Update Services (WSUS), and the Microsoft Download Center.
What you can do in the meanwhile to prepare your business for the change:
1. Check the Microsoft site: Preparing for daylight saving time changes in 2007
2. Participate on Microsoft Support WebCast: Deploying Microsoft Windows 2000 updates for daylight saving time changes for worldwide use, which is specifically focused on Microsoft Windows 2000. It talks about the registry changes and the time zones that are being updated. This WebCast also tells how to confirm that the updates have been applied, and then provides information about testing and rollback procedure.